Multi-function milling cutter

ABSTRACT

A multi-function miller cutter includes a shank with a receiving portion defined in the shank at an end of the shank. A threaded hole is defined in the receiving portion so as to secure a disposable cutter. An angle is clamped between an axis of the shank and a center of the threaded hole.

FIELD OF THE INVENTION

The present invention relates to a milling cutter that is able to mill, drill and cut

BACKGROUND OF THE INVENTION

A conventional drill bit 1 is disclosed in FIG. 18, and generally made by alloy steel or high speed steel which is so hard and is difficult to be cut so that it is expensive. For a drill bit with an outer diameter 16 mm, it costs 100 U.S. dollars. This kind of drill bit can be used in a universe machine to drill, cut, mill and/or groove. Nevertheless, the conventional drill bit 1 includes the following shortcomings which are:

-   -   1. The conventional drill bit is made in one piece and         expensive, although it performs different functions and reduces         times of replacement of the drill bits.     -   2. Once there is a crack or is damaged, a special grinding         machine is needed to grind the drill bit and this is a         time-consuming job.     -   3. The drill bit has to be zero again after it is ground or         disengaged from the machine, and this spends a lot of time.     -   4. The drill bit has to be discarded if it is worn too much and         the length of the drill bit is too short.

The present invention intends to provide a multi-function milling cutter that includes a receiving portion for connecting a disposable cutter whose edges and nose are able to perform different functions.

SUMMARY OF THE INVENTION

The present invention relates to a multi-function miller cutter that comprises a shank and a receiving portion is defined in the shank at an end of the shank. A threaded hole is defined in the receiving portion and a disposable cutter is securely engaged with the threaded hole in the receiving portion. An angle is clamped between an axis of the shank and a center of the threaded hole.

The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a side view of the present invention;

FIG. 4 shows that the cutter is making a rounded edge;

FIG. 5 shows that the cutter is making a V-shaped groove;

FIG. 6 shows that the cutter is making a sink hole;

FIG. 7 shows that the cutter is making hole;

FIG. 8 shows that the cutter is trimming a tubular member;

FIG. 9 shows that the cutter is proceeding an end cutting;

FIG. 10 shows that the cutter is making a central hole;

FIG. 11 shows that the cutter is rounding a periphery of a hole;

FIG. 12 shows that the cutter is drilling a hole;

FIG. 13 shows that the cutter is engraving on a surface;

FIG. 14 shows an A type disposable cutter;

FIG. 15 shows the disposable cutter is a B type 60-degree drill;

FIG. 16 shows an R type disposable cutter;

FIG. 17 shows the number of cutter edges of the disposable cutter, and

FIG. 18 shows a conventional drill bit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 to 3, the multi-function milling cutter of the present invention comprises a shank 21 and a receiving portion 33 is defined in the shank 21 at an end of the shank 21. A threaded hole 221 is defined in the receiving portion 33 and an angle is clamped between an axis of the shank 21 and a center of the threaded hole 221. The angle is so small that only 0.1 mm distance “e” is defined between the axis of the shank 21 and the center of the threaded hole 221. A diamond-shaped disposable cutter 23 is securely engaged with the receiving portion 33. Each side of the disposable cuter 23 is a cutting edge so as to perform different functions.

The receiving portion 33 includes an inclined angle and a tip of the disposable cutter 23 is located toward forward. By this specific arrangement, the thickness of the shank 21 at the portion of the receiving portion 33 can be made thicker to support the disposable cutter 23. One of the four tips faces downward such that when the shank 21 is rotated, only the cutting edge “a” that is offset performs the cutting function. The rest of the cutting edges are located within the radius of cutting so that they are not in contact with the object to be cut. Therefore, every cutting edge can be used.

As shown in FIG. 4 which shows that the disposable 23 cutter is making a rounded edge. FIG. 5 shows that the disposable cutter 23 is making a V-shaped groove. FIG. 6 shows that the disposable cutter 23 is making a sink hole.

FIGS. 7 to 9 show that the milling cutter is used with a lathe wherein FIG. 7 shows that the milling cutter is making hole in an object 30, FIG. 8 shows that the milling cutter is trimming a tubular member, and FIG. 9 shows that the milling cutter is proceeding an end cutting. This allows the user to proceed different functions without changing the cutter.

FIG. 10 shows that the milling cutter is making a central hole. FIG. 11 shows that the milling cutter is rounding a periphery of a hole. FIG. 12 shows that the milling cutter is drilling a hole. FIG. 13 shows that the milling cutter is engraving on a surface of the object 30. The milling cutter can be cooperated with NC machines and makes desired patterns or words on the object 13.

FIG. 14 shows the disposable cutter 40 is an AB type center cutter that has a tip 41 and two cutting edges 42 between which the tip 41 is located. FIG. 15 shows that the AB type center cutter is able to make an A type central hole and B type central hole. If the AB type center cutter is used by its tip 41 and cutting edge 42, the A type central hole 61 includes a 60-degree taper hole. The AB type center cutter may also be used with a 60-degree centering pin to proceed heavy cutting and milling.

FIG. 15 shows that when the AB type cutter 40 drills a deeper B type hole 62, the cutting edge 42 is simultaneously drilling a rounded periphery “C” of 120 degrees along the periphery of the hole 62. Even if the rounded periphery “C” is hit, the hole 62 is not affected.

FIG. 16 shows that the disposable cutter 50 is R type center cutter that has a tip 51 and four curve cutting edges 52 located at four corners of the disposable cutter 50. The disposable cutter 50 makes an R type central hole 63 and the cutting edges 52 cut into two stepped sink hole 73 in the surface 72 of the object 17. The two stepped sink hole 73 contacts the centering pin 80 by a circle which is a small area. This is used for precision cutting. FIG. 17 shows that the number of cutter edges of the disposable cutter can be two.

The milling cutter can proceed different functions so that it is not necessary to be replaced with different cutters. Only the disposable cutter needs to be replaced and this saves a lot of time and the efficiency is increased.

While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 

1. A multi-function miller cutter comprising: a shank (21) and a receiving portion (33) defined in the shank (21) at an end of the shank (21), a threaded hole (221) defined in the receiving portion (33) and an angle clamped between an axis of the shank (21) and a center of the threaded hole (221), and a disposable cutter (23) securely engaged with the receiving portion (33).
 2. The miller cutter as claimed in claim 1, wherein the receiving portion (33) includes an inclined angle and a tip of the disposable cutter (23) is located toward forward.
 3. The miller cutter as claimed in claim 1, wherein the disposable cutter (40) is AB type center cutter that has a tip (41) and two cutting edges (42) between which the tip (41) is located.
 4. The miller cutter as claimed in claim 1, wherein the disposable cutter (50) is R type center cutter that has a tip 51 and four cutting edges (52) located at four corners of the disposable cutter (50). 